Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/80r15 vs 225/85r15 Tire Comparison Side By Side
  215/80-15 225/85-15 Difference
Diameter inches (mm) 28.54 (725) 30.06 (763.5) 1.52 (38.5) 5.3%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 89.67 (2277.65) 94.43 (2398.61) 4.76 (120.95) 5.3%
Sidewall Height inches (mm) 6.77 (172) 7.53 (191.25) 0.76 (19.25) 11.2%
Revolutions per mile (km) 706.58 (439.05) 670.95 (416.91) -35.63 (-22.14) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.06 mph (33.9 km/h)
25 mph (40.23 km/h)26.33 mph (42.37 km/h)
30 mph (48.28 km/h)31.59 mph (50.84 km/h)
35 mph (56.33 km/h)36.86 mph (59.32 km/h)
40 mph (64.37 km/h)42.12 mph (67.79 km/h)
45 mph (72.42 km/h)47.39 mph (76.27 km/h)
50 mph (80.47 km/h)52.66 mph (84.74 km/h)
55 mph (88.51 km/h)57.92 mph (93.21 km/h)
60 mph (96.56 km/h)63.19 mph (101.69 km/h)
65 mph (104.61 km/h)68.45 mph (110.16 km/h)
70 mph (112.65 km/h)73.72 mph (118.64 km/h)
75 mph (120.7 km/h)78.98 mph (127.11 km/h)
80 mph (128.75 km/h)84.25 mph (135.58 km/h)
85 mph (136.79 km/h)89.51 mph (144.06 km/h)
90 mph (144.84 km/h)94.78 mph (152.53 km/h)
95 mph (152.89 km/h)100.04 mph (161.01 km/h)
100 mph (160.93 km/h)105.31 mph (169.48 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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